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Schedule of consolidated actuarial information (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
Fair value of plan assets R$ 9,378 R$ 10,420 R$ 10,366 R$ 9,063
Net liabilities in the statement of financial position 6,205 6,843 6,709 4,989
Pension Plans And Retirement Supplement Plans [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 2,670 2,909 2,972 2,170
Health Plan [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 3,469 3,319 3,102 2,344
Dental Plan [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 66 64 61 48
life insurance [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 551 R$ 574 R$ 427
Actuarial assumption of expected rates of pension increases [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations 15,561 17,242    
Fair value of plan assets (9,378) (10,420)    
Net liabilities in the statement of financial position 6,205 6,843    
Actuarial assumption of expected rates of pension increases [member] | Initial Net Liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 6,183 6,822    
Actuarial assumption of expected rates of pension increases [member] | Effect of asset ceiling [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 22 21    
Actuarial assumption of expected rates of pension increases [member] | Pension Plans And Retirement Supplement Plans [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations 12,026 13,308    
Fair value of plan assets (9,378) (10,420)    
Net liabilities in the statement of financial position 2,670 2,909    
Actuarial assumption of expected rates of pension increases [member] | Pension Plans And Retirement Supplement Plans [member] | Initial Net Liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 2,648 2,888    
Actuarial assumption of expected rates of pension increases [member] | Pension Plans And Retirement Supplement Plans [member] | Effect of asset ceiling [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 22 21    
Actuarial assumption of expected rates of pension increases [member] | Health Plan [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations 3,469 3,319    
Net liabilities in the statement of financial position 3,469 3,319    
Actuarial assumption of expected rates of pension increases [member] | Health Plan [member] | Initial Net Liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 3,469 3,319    
Actuarial assumption of expected rates of pension increases [member] | Dental Plan [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations 66 64    
Net liabilities in the statement of financial position R$ 66 64    
Actuarial assumption of expected rates of pension increases [member] | Dental Plan [member] | Initial Net Liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position   64    
Actuarial assumption of expected rates of pension increases [member] | life insurance [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations   551    
Net liabilities in the statement of financial position   551    
Actuarial assumption of expected rates of pension increases [member] | life insurance [member] | Initial Net Liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position   R$ 551